| abstract |
A process for the preparation of chlorinated and fluorinated benzene compounds of the general formula (1)n n in which R denotes -CN or -COOalkyl(C₁-C₆), and X and Y each denote chlorine or fluorine, X and Y being not identical, by fluorodenitration, which comprises reacting a compound of the formula (2)n n in which R is defined as above, and X' and Y' each denote chlorine or nitro, X' and Y' being nor identical, with potassium fluoride in a dipolar aprotic solvent in the presence of a transfer catalyst at a temperature from about 50°C to about 250°C. |